As mentioned in this episode of Doctor Who: Podshock, if you are looking to see The Five(ish) Doctors Reboot, it is still available here on my blog post about it embedded on the bottom. I can't say for how long it will work though.

It would had been difficult to include all the past living actors that played the Doctor in the 50th anniversary special... especially if they were playing the Doctor again since none of them except McGann really look the way they did before they regenerated. Though they could had played other characters, perhaps never interacting with the 11th or 10th Doctor in it. But baring that, The Five(ish) Doctors Reboot fills the gap left by the actual 50th anniversary special (The Day of the Doctor) nicely.